﻿using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Text;
using System.IO;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

namespace AspNetCs.Common
{
    /// <summary>
    /// VryImgGen 的摘要说明
    /// </summary>
    public class VryImgGen
    {
        public static string ChineseChars = String.Empty;

        /// <summary>
        /// 英文与数字串
        /// </summary>
        protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

        public VryImgGen()
        {
            rnd = new Random(unchecked((int)DateTime.Now.Ticks));
        }
        /// <summary>
        /// 全局随机数生成器
        /// </summary>
        private Random rnd;

        int length = 5;
        /// <summary>
        /// 验证码长度(默认6个验证码的长度)
        /// </summary>
        public int Length
        {
            get { return length; }
            set { length = value; }
        }

        int fontSize = 18;
        /// <summary>
        /// 验证码字体大小(为了显示扭曲效果，默认30像素，可以自行修改)
        /// </summary>
        public int FontSize
        {
            get { return fontSize; }
            set { fontSize = value; }
        }

        int padding = 4;
        /// <summary>
        /// 边框补(默认4像素)
        /// </summary>
        public int Padding
        {
            get { return padding; }
            set { padding = value; }
        }

        bool chaos = true;
        /// <summary>
        /// 是否输出燥点(默认输出)
        /// </summary>
        public bool Chaos
        {
            get { return chaos; }
            set { chaos = value; }
        }

        Color chaosColor = Color.LightGray;
        /// <summary>
        /// 输出燥点的颜色(默认灰色)
        /// </summary>
        public Color ChaosColor
        {
            get { return chaosColor; }
            set { chaosColor = value; }
        }

        Color backgroundColor = Color.White;
        /// <summary>
        /// 自定义背景色(默认白色)
        /// </summary>
        public Color BackgroundColor
        {
            get { return backgroundColor; }
            set { backgroundColor = value; }
        }

        Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
        /// <summary>
        /// 自定义随机颜色数组
        /// </summary>
        public Color[] Colors
        {
            get { return colors; }
            set { colors = value; }
        }

        string[] fonts = { "Arial", "Georgia" };
        /// <summary>
        /// 自定义字体数组
        /// </summary>
        public string[] Fonts
        {
            get { return fonts; }
            set { fonts = value; }
        }

        #region 产生波形滤镜效果

        private const double PI = 3.1415926535897932384626433832795;
        private const double PI2 = 6.283185307179586476925286766559;

        /// <summary>
        /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）
        /// </summary>
        /// <param name="srcBmp">图片路径</param>
        /// <param name="bXDir">如果扭曲则选择为True</param>
        /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>
        /// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>
        /// <returns></returns>
        public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
        {
            System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);

            // 将位图背景填充为白色
            System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
            graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
            graph.Dispose();

            double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;

            for (int i = 0; i < destBmp.Width; i++)
            {
                for (int j = 0; j < destBmp.Height; j++)
                {
                    double dx = 0;
                    dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
                    dx += dPhase;
                    double dy = Math.Sin(dx);

                    // 取得当前点的颜色
                    int nOldX = 0, nOldY = 0;
                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
                    nOldY = bXDir ? j : j + (int)(dy * dMultValue);

                    System.Drawing.Color color = srcBmp.GetPixel(i, j);
                    if (nOldX >= 0 && nOldX < destBmp.Width
                     && nOldY >= 0 && nOldY < destBmp.Height)
                    {
                        destBmp.SetPixel(nOldX, nOldY, color);
                    }
                }
            }

            return destBmp;
        }



        #endregion

        /// <summary>
        /// 生成校验码图片
        /// </summary>
        /// <param name="code">验证码</param>
        /// <returns></returns>
        public Bitmap CreateImage(string code)
        {
            int fSize = FontSize;
            int fWidth = fSize + Padding;

            int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
            int imageHeight = fSize * 2 + Padding * 2;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);

            Graphics g = Graphics.FromImage(image);

            g.Clear(BackgroundColor);

            //给背景添加随机生成的燥点
            if (this.Chaos)
            {

                Pen pen = new Pen(ChaosColor, 0);
                int c = Length * 10;

                for (int i = 0; i < c; i++)
                {
                    int x = rnd.Next(image.Width);
                    int y = rnd.Next(image.Height);

                    g.DrawRectangle(pen, x, y, 1, 1);
                }
            }

            int left = 0, top = 0, top1 = 1, top2 = 1;

            int n1 = (imageHeight - FontSize - Padding * 2);
            int n2 = n1 / 4;
            top1 = n2;
            top2 = n2 * 2;

            Font f;
            Brush b;

            int cindex, findex;

            //随机字体和颜色的验证码字符
            for (int i = 0; i < code.Length; i++)
            {
                cindex = rnd.Next(Colors.Length - 1);
                findex = rnd.Next(Fonts.Length - 1);

                f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                b = new System.Drawing.SolidBrush(Colors[cindex]);

                if (i % 2 == 1)
                {
                    top = top2;
                }
                else
                {
                    top = top1;
                }

                left = i * fWidth;

                g.DrawString(code.Substring(i, 1), f, b, left, top);
            }

            //画一个边框 边框颜色为Color.Gainsboro
            g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
            g.Dispose();

            image = TwistImage(image, true, 8, 4);

            return image;
        }

        /// <summary>
        /// 生成随机字符码
        /// </summary>
        /// <param name="codeLen">字符串长度</param>
        /// <param name="zhCharsCount">中文字符数</param>
        /// <returns></returns>
        public string CreateVerifyCode(int codeLen, int zhCharsCount)
        {
            char[] chs = new char[codeLen];

            int index;
            for (int i = 0; i < zhCharsCount; i++)
            {
                index = rnd.Next(0, codeLen);
                if (chs[index] == '\0')
                    chs[index] = CreateZhChar();
                else
                    --i;
            }
            for (int i = 0; i < codeLen; i++)
            {
                if (chs[i] == '\0')
                    chs[i] = CreateEnOrNumChar();
            }

            return new string(chs, 0, chs.Length);
        }

        /// <summary>
        /// 生成默认长度5的随机字符码
        /// </summary>
        /// <returns></returns>
        public string CreateVerifyCode()
        {
            return CreateVerifyCode(Length, 0);
        }

        /// <summary>
        /// 生成英文或数字字符
        /// </summary>
        /// <returns></returns>
        protected char CreateEnOrNumChar()
        {
            return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)];
        }

        /// <summary>
        /// 生成汉字字符
        /// </summary>
        /// <returns></returns>
        protected char CreateZhChar()
        {
            //若提供了汉字集，查询汉字集选取汉字
            if (ChineseChars.Length > 0)
            {
                return ChineseChars[rnd.Next(0, ChineseChars.Length)];
            }
            //若没有提供汉字集，则根据《GB2312简体中文编码表》编码规则构造汉字
            else
            {
                byte[] bytes = new byte[2];

                //第一个字节值在0xb0, 0xf7之间
                bytes[0] = (byte)rnd.Next(0xb0, 0xf8);
                //第二个字节值在0xa1, 0xfe之间
                bytes[1] = (byte)rnd.Next(0xa1, 0xff);

                //根据汉字编码的字节数组解码出中文汉字
                string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);

                return str1[0];
            }
        }

    }
    /// <summary>
    ///Asp.net 生成验证码方法一
    /// </summary>
    public class CreateImage
    {
        public CreateImage()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        public static void DrawImage(string Sessionstr)
        {
            CreateImage img = new CreateImage();
            HttpContext.Current.Session[Sessionstr] = img.RndNum(4);
            img.CreateImages(HttpContext.Current.Session[Sessionstr].ToString());
        }
        public static void DrawImage()
        {
            DrawImage("CheckCode");
        }




        /// <summary>
        /// 生成验证图片
        /// </summary>
        /// <param name="checkCode">验证字符</param>
        private void CreateImages(string checkCode)
        {
            #region old

            //int iwidth = (int)(checkCode.Length * 13);
            //System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 25);
            //Graphics g = Graphics.FromImage(image);
            //g.Clear(Color.White);
            ////定义颜色
            ////Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            //Color[] c = { Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black };
            ////定义字体 
            //string[] font = { "Arial", "宋体", "宋体", "Arial", "宋体" };
            //Random rand = new Random();
            ////随机输出噪点
            //for (int i = 0; i < 20; i++)
            //{
            //    int x = rand.Next(image.Width);
            //    int y = rand.Next(image.Height);
            //    g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
            //}

            ////输出不同字体和颜色的验证码字符
            //for (int i = 0; i < checkCode.Length; i++)
            //{
            //    int cindex = rand.Next(7);
            //    int findex = rand.Next(5);

            //    Font f = new System.Drawing.Font(font[findex], 12, System.Drawing.FontStyle.Bold);
            //    Brush b = new System.Drawing.SolidBrush(c[cindex]);
            //    int ii = 4;
            //    //if ((i + 1) % 2 == 0)
            //    //{
            //    //    ii = 2;
            //    //}
            //    g.DrawString(checkCode.Substring(i, 1), f, b, 3 + (i * 12), ii);
            //}
            ////画一个边框
            //g.DrawRectangle(new Pen(Color.Gray, 0), 0, 0, image.Width - 1, image.Height - 1);
            ////输出到浏览器
            //System.IO.MemoryStream ms = new System.IO.MemoryStream();
            //image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            //HttpContext.Current.Response.ClearContent();
            ////Response.ClearContent();
            //HttpContext.Current.Response.ContentType = "image/Jpeg";
            //HttpContext.Current.Response.BinaryWrite(ms.ToArray());
            //g.Dispose();
            //image.Dispose(); 
            #endregion
            int iwidth = (int)(checkCode.Length * 13);
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 25);
            Graphics g = Graphics.FromImage(image);
            g.Clear(Color.White);
            //定义颜色
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            //Color[] c = { Color.Black };
            //定义字体 
            string[] font = { "Arial" };
            Random rand = new Random();
            //随机输出噪点
            for (int i = 0; i < 15; i++)
            {
                int x = rand.Next(image.Width);
                int y = rand.Next(image.Height);
                g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
            }

            //输出不同字体和颜色的验证码字符
            for (int i = 0; i < checkCode.Length; i++)
            {
                int cindex = rand.Next(7);
                int findex = rand.Next(5);

                Font f = new System.Drawing.Font(font[0], 12, System.Drawing.FontStyle.Bold);
                Brush b = new System.Drawing.SolidBrush(c[i]);
                int ii = 4;
                //if ((i + 1) % 2 == 0)
                //{
                //    ii = 2;
                //}
                g.DrawString(checkCode.Substring(i, 1), f, b, (i * 12), ii);
            }
            //画一个边框
            g.DrawRectangle(new Pen(Color.Gray, 0), 0, 0, image.Width - 1, image.Height - 1);
            //输出到浏览器
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            HttpContext.Current.Response.ClearContent();
            //Response.ClearContent();
            HttpContext.Current.Response.ContentType = "image/Jpeg";
            HttpContext.Current.Response.BinaryWrite(ms.ToArray());
            g.Dispose();
            image.Dispose();



        }
        /// <summary>
        /// 生成随机的字母
        /// </summary>
        /// <param name="VcodeNum">生成字母的个数</param>
        /// <returns>string</returns>
        private string RndNum(int VcodeNum)
        {
            string VNum = ""; //由于字符串很短，就不用StringBuilder了
            #region Old Random


            //string Vchar = "0,1,2,3,4,5,6,7,8,9";
            //string[] VcArray = Vchar.Split(',');
            //string VNum = ""; //由于字符串很短，就不用StringBuilder了
            //try
            //{
            //    int temp = -1; //记录上次随机数值，尽量避免生产几个一样的随机数

            //    //采用一个简单的算法以保证生成随机数的不同
            //    Random rand = new Random();
            //    for (int i = 1; i < VcodeNum + 1; i++)
            //    {
            //        if (temp != -1)
            //        {
            //            rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
            //        }
            //        int t = rand.Next(VcArray.Length);
            //        if (temp != -1 && temp == t)
            //        {
            //            return RndNum(VcodeNum);
            //        }
            //        temp = t;
            //        VNum += VcArray[t];
            //    }
            //}
            //catch
            //{
            //    //TODO:小心成为死循环
            //    VNum = RndNum(VcodeNum);
            //} 

            #endregion

            VNum = Rand.Str(VcodeNum).ToLower();

            return VNum;
        }
    }

    /// <summary>
    ///Asp.net 生成验证码方法二
    /// </summary>
    public class ValidateNumber
    {
        public ValidateNumber()
        {
        }
        /// <summary>
        /// 验证码的最大长度
        /// </summary>
        public int MaxLength
        {
            get { return 10; }
        }
        /// <summary>
        /// 验证码的最小长度
        /// </summary>
        public int MinLength
        {
            get { return 1; }
        }
        /// <summary>
        /// 生成验证码
        /// </summary>
        /// <param name="length">指定验证码的长度</param>
        /// <returns></returns>
        public string CreateValidateNumber(int length)
        {
            int[] randMembers = new int[length];
            int[] validateNums = new int[length];
            string validateNumberStr = "";
            //生成起始序列值
            int seekSeek = unchecked((int)DateTime.Now.Ticks);
            Random seekRand = new Random(seekSeek);
            int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
            int[] seeks = new int[length];
            for (int i = 0; i < length; i++)
            {
                beginSeek += 10000;
                seeks[i] = beginSeek;
            }
            //生成随机数字
            for (int i = 0; i < length; i++)
            {
                Random rand = new Random(seeks[i]);
                int pownum = 1 * (int)Math.Pow(10, length);
                randMembers[i] = rand.Next(pownum, Int32.MaxValue);
            }
            //抽取随机数字
            for (int i = 0; i < length; i++)
            {
                string numStr = randMembers[i].ToString();
                int numLength = numStr.Length;
                Random rand = new Random();
                int numPosition = rand.Next(0, numLength - 1);
                validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
            }
            //生成验证码
            for (int i = 0; i < length; i++)
            {
                validateNumberStr += validateNums[i].ToString();
            }
            HttpContext.Current.Session["VerifyCode"] = validateNumberStr;
            return validateNumberStr;
        }
        /// <summary>
        /// 创建验证码的图片
        /// </summary>
        /// <param name="containsPage">要输出到的page对象</param>
        /// <param name="validateNum">验证码</param>
        public void CreateValidateGraphic(Page containsPage, string validateNum)
        {
            Bitmap image = new Bitmap((int)Math.Ceiling(validateNum.Length * 12.5), 22);
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器
                Random random = new Random();
                //清空图片背景色
                g.Clear(Color.White);
                //画图片的干扰线
                for (int i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }
                Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
                 Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(validateNum, font, brush, 3, 2);
                //画图片的前景干扰点
                for (int i = 0; i < 100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);
                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                //保存图片数据
                MemoryStream stream = new MemoryStream();
                image.Save(stream, ImageFormat.Jpeg);
                //输出图片
                containsPage.Response.Clear();
                containsPage.Response.ContentType = "image/jpeg";
                containsPage.Response.BinaryWrite(stream.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
        /// <summary>
        /// 得到验证码图片的长度
        /// </summary>
        /// <param name="validateNumLength">验证码的长度</param>
        /// <returns></returns>
        public static int GetImageWidth(int validateNumLength)
        {
            return (int)(validateNumLength * 12.5);
        }
        /// <summary>
        /// 得到验证码的高度
        /// </summary>
        /// <returns></returns>
        public static double GetImageHeight()
        {
            return 22.5;
        }
    }

    public class Rand
    {
        /// <summary>
        /// 生成随机数字
        /// </summary>
        /// <param name="length">生成长度</param>
        /// <returns></returns>
        public static string Number(int Length)
        {
            return Number(Length, false);
        }

        /// <summary>
        /// 生成随机数字
        /// </summary>
        /// <param name="Length">生成长度</param>
        /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
        /// <returns></returns>
        public static string Number(int Length, bool Sleep)
        {
            if (Sleep)
                System.Threading.Thread.Sleep(3);
            string result = "";
            System.Random random = new Random();
            for (int i = 0; i < Length; i++)
            {
                result += random.Next(10).ToString();
            }
            return result;
        }

        /// <summary>
        /// 生成随机字母与数字
        /// </summary>
        /// <param name="IntStr">生成长度</param>
        /// <returns></returns>
        public static string Str(int Length)
        {
            return Str(Length, false);
        }
        /// <summary>
        /// 生成随机字母与数字
        /// </summary>
        /// <param name="Length">生成长度</param>
        /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
        /// <returns></returns>
        public static string Str(int Length, bool Sleep)
        {
            if (Sleep)
                System.Threading.Thread.Sleep(3);
            char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
            string result = "";
            int n = Pattern.Length;
            System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < Length; i++)
            {
                int rnd = random.Next(0, n);
                result += Pattern[rnd];
            }
            return result;
        }


        /// <summary>
        /// 生成随机纯字母随机数
        /// </summary>
        /// <param name="IntStr">生成长度</param>
        /// <returns></returns>
        public static string Str_char(int Length)
        {
            return Str_char(Length, false);
        }

        /// <summary>
        /// 生成随机纯字母随机数
        /// </summary>
        /// <param name="Length">生成长度</param>
        /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
        /// <returns></returns>
        public static string Str_char(int Length, bool Sleep)
        {
            if (Sleep) System.Threading.Thread.Sleep(3);
            char[] Pattern = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
            string result = "";
            int n = Pattern.Length;
            System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < Length; i++)
            {
                int rnd = random.Next(0, n);
                result += Pattern[rnd];
            }
            return result;
        }
    }



}